Epoxy acrylates are the most frequently used oligomers in a wide number of application areas in the radiation cure industry. They provide high reactivity, chemical resistance, and high gloss to formulations for a wide variety of applications.
Sartomer’s epoxy acrylate oligomers offer improved performance in many applications. Potential application areas include, but are not limited to polymer concrete, electronics, coatings, inks, adhesives, potting compounds, and sealants.
Sartomer’s Epoxy Acrylate Oligomers
Oligomers Used in Cure-in-Place Technology Specialty acrylic esters are used in the development of cure-in-place coatings offering numerous improvements over conventionally formulated and cured solvent-based systems. Low to zero volatile organic compound (VOC) content, improved performance, and significantly decreased drying times can be achieved when specialty acrylic esters are used in formulating cure-in-place coatings, inks, adhesives, and electronic products to name a few.
Cure-in-place coatings are coatings that are applied and immediately cured or polymerized on the substrate, as the name implies. Methods of curing-in-place include free radical initiated curing such as in ultraviolet light or electron beam radiation systems, peroxide or azonitrile thermal systems; and Michael Addition polymerization reactions with polyamines. All of these technologies allow coatings to be cured-in-place using specialty acrylic esters-acrylate and methacrylate monomers and oligomers.
Formulations for cure-in-place coatings, inks, adhesives, and electronics typically consist of a blend of an oligomer, a monofunctional monomer, multifunctional monomer, photoinitiator (for UV), and often additives and pigments. The oligomer imparts most of the basic properties of the final cured material. Sartomer’s oligomers are designed to yield specific desired performance requirements.
Aliphatic Epoxy Oligomers
Sartomer has developed aliphatic epoxy acrylate oligomers, namely CN132 and CN133, that not only offer all of the traditional advantages of using an epoxy acrylate but also offer low viscosity and excellent adhesion.
Bis-Phenol A (BPA) Epoxy Olgomer Resins
Conventional epoxy acrylates based on diglycidyl ether bisphenol A are the most frequently used oligomers in the UV-curing industry. They are hard and fast curing, and offer abrasion and chemical resistance. Unfortunately, these oligomers also yellow over time, have high viscosities, and have poor adhesion as a result of their inherent hardness.
Sartomer has developed epoxy acrylate oligomers that not only offer all of the traditional advantages of using an epoxy acrylate but also offer low viscosity and excellent adhesion.
The highest refractive indices are seen in the neat epoxy acrylates based on diglycidyl ether of bisphenol A. These products have a higher concentration of aromatic ring structures per unit area.
Modified Epoxy Oligomer Resin
Modified expoxy oligomers provide excellent performance attributes, namely a good water balance, high reactivitiy, and fast cure speed.
Novalac Expoxy Oligomer Resin
Novalac acrylate neat oligomer is trifunctional and it is blended with a trifunctional monomer. When blended with specific monomers, the functionality and aromatic nature of these oligomers can yield very hard films.
Automotive and transportation
- Adhesives and sealants
Paint, coatings and adhesives
- UV coating
- UV curing
Insulating window glass sealants